A rack mountable cable distribution enclosure. The cable distribution enclosure includes a tray that slides forwards and backwards out of the cable distribution enclosure. The tray incudes an adapter plate bracket which receives a plurality of adapter plates. The adapter plates are mounted in a horizontal orientation, parallel to the sliding tray. This reduces the height of the cable distribution enclosure for installations where less space is available. The adapter plate bracket is angled relative to the sliding tray to prevent bending of the cable.